HP XP7 Storage - Manual (Page 17)

Table 1 General system requirements (continued)
Requirement Item
sample configuration definition files in HP XP7 RAID Manager Installation and
Configuration User Guide.
•
It is recommended that you specify different paths and path groups for Cnt Ac-S
and Cnt Ac-J secondary systems when using CU Free.
Pair volumes • A P-VOL may be copied to one S-VOL.
•
The P-VOL and S-VOL must be equal in size.
•
The P-VOL and S-VOL must be of same emulation type.
•
Supported emulation types for OPEN system pair volumes: OPEN-V
•
The maximum size of the P-VOL and S-VOL is 4,194,304.000 MB
(8,589,934,592 blocks).
• The minimum volume size of the P-VOL and S-VOL is 46.875MB (96,000 blocks).
•
When Cnt Ac-S is cascaded with Cnt Ac-J, a data volume may be copied to
multiple data centers.
Journals and journal volumes •
Maximum number of journals supported per storage system: 256 (0 to 255)
•
Recommended number of journals per storage system: Up to 16 per storage
system
• Maximum number of journal volumes: 2.
If two are registered, only one is used (the first one registered). The second is
not used unless needed for maintenance, or to replace the first one.
•
Maximum journal volume size: 60TB
• Minimum journal volume size: 1.55TB
•
Maximum number of data volumes per journal: 8,192
• Emulation types for journal volumes: OPEN-V. Journal volumes must be THP
V-VOLs.
For more information, see “Planning journal volumes ” (page 23) .
Virtual LUN: Supported volume types
•
Can be used for data and journal volumes.
• S-VOL capacity must equal P-VOL capacity.
Cache Residency:
•
Data volume: yes
•
Journal volume: no
Limited per XP7 system. See “Maximum number of pairs allowed ” (page 24) . Maximum number of pairs
Supported RAID groups •
RAID1, RAID5, and RAID6 are supported for both data and journal volumes.
•
RAID1, RAID5, and RAID6 can co-exist in the same journal.
Must be operable for primary and secondary systems to ensure pair creation
success. The secondary system cache must be configured to adequately support Cache and nonvolatile storage
(NVS)
Cnt Ac-J remote-copy workloads, as well as local workload activity. In general,
increase cache capacity by 25 percent for Cnt Ac-J. Also, 1 GB should be added
for each journal on the system.
Note: When pair status is COPY, neither cache nor shared memory can be added
to or removed from the system. When either of these tasks is to be performed, first
split any pairs in COPY, status, then resynchronize when the cache or shared
memory operation is completed.
System requirements 17